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 TM 9-4120-425-14&P
OPERATION UNDER USUAL CONDITIONS - Continued
0006-00
STARTING AND OPERATING INSTRUCTIONS FOR COOLING - Continued
Starting - Continued
8.
Turn the temperature selector switch to WARMER.
9.
Position circuit breaker to "ON".
10. Position the mode selector switch to VENT, then position the mode selector switch to COOL.
Cooling Operation
WARNING
Do not operate the air conditioner in cool mode if the refrigerant is at a low level or if bubbles appear
in sight glass. Equipment damage can result.
Compressor will begin operation. Allow 60 seconds delay for compressor to start.
After starting the air conditioner for cooling operation:
1.
Leave the mode selector switch on COOL.
2.
Adjust the temperature selector switch from WARMER to COOLER to select the degree of cooling desired. See
Table 1 Operator Control Setting.
3.
Adjust the evaporator discharge louvers individually to direct the airflow as desired.
NOTE
Cool air is denser than warm air so it has a tendency to flow downward. To offset this tendency, it is
often advisable to adjust the evaporator discharge louvers to direct the cool air slightly upward.
NOTE
To open the ventilation damper door to admit fresh air, unlock the ventilation damper control chain,
pull the door to an open position (against spring closure) and secure chain in slot.
Cooling With Fresh Air
1.
When the ventilation damper door is open to admit fresh air, partially close the evaporator intake louver to balance
the incoming air.
2.
Keep the ventilation damper door closed during heavy rain.
Stopping The Air Conditioner
1.
Position the mode selector switch to OFF.
2.
Adjust the ventilation damper control chain to close the damper door.
3.
If a shutdown is to be for an extended period, cover condenser side of unit with canvas cover and disconnect the
power cable.
0006-00-3
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